SET(DOXYGEN_XML_OUTPUT          "doxygen-xml"      PARENT_SCOPE)
SET(DOXYGEN_FILE_PATTERNS       "*.h  *.hh  *.hxx" PARENT_SCOPE)
SET(DOXYGEN_GENERATE_XML        "YES"              PARENT_SCOPE)
SET(DOXYGEN_EXPAND_ONLY_PREDEF  "NO"               PARENT_SCOPE)
SET(DOXYGEN_ENABLE_PREPROCESSING "YES" PARENT_SCOPE)
SET(DOXYGEN_MACRO_EXPANSION      "YES" PARENT_SCOPE)

SET(DOXYGEN_PREDEFINED          "IS_DOXYGEN"       PARENT_SCOPE)
